linux-kernel - RE: [PATCH 1/1] perf beauty: Don't use 'find ... -printf' as it isn't available in busybox

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Date:   Fri, 1 Dec 2023 12:05:31 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Arnaldo Carvalho de Melo' <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
CC:     Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] perf beauty: Don't use 'find ... -printf' as it isn't
 available in busybox

...
>  # Create list of architectures that have a specific errno.h.
>  archlist=""
> -for arch in $(find $toolsdir/arch -maxdepth 1 -mindepth 1 -type d -printf "%f\n" | sort -r); do
> +for arch in $(find $toolsdir/arch -maxdepth 1 -mindepth 1 -type d | while read arch ; do basename
> $arch ; done | sort -r); do
>  	test -f $toolsdir/arch/$arch/include/uapi/asm/errno.h && archlist="$archlist $arch"
>  done

Jeepers ...
Does this work?
	for f in $toolsdir/arch/*/include/uapi/asm/errno.h; do
		[ ! -f $f ] && break
		d=${f%/include/uapi/asm/errno.h}
		archlist="${d##*/} $archlist"
	done
No fork()s or exec()s.
I think it only differs in having a trailing space instead of a leading one.

	David

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